| Key technologies for drought disaster risk assessment in typical vulnerable areas of eastern Gansu Province |
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| DOI：10.7606/j.issn.1000-7601.2022.02.24 |
| Key Words: drought disaster disaster\|causing factors risk assessment typical vulnerable areas |
| Author Name | Affiliation | | CHEN Siming | School of Water and Environmental, Chang’an University, Xi’an, Shaanxi 710054, China | | HUO Aidi | School of Water and Environmental, Chang’an University, Xi’an, Shaanxi 710054, China；Key Laboratory of Subsurface Hydrology and Ecological Effects in the Arid Region under Ministry of Education, Chang’an University, Xi’an, Shaanxi 710054, China | | Zhang Dan | Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China | | CHEN Sibin | School of Water and Environmental, Chang’an University, Xi’an, Shaanxi 710054, China | | ZHAO Zhixin | School of Water and Environmental, Chang’an University, Xi’an, Shaanxi 710054, China | | CHEN Jian | School of Water and Environmental, Chang’an University, Xi’an, Shaanxi 710054, China |
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| Abstract: |
| Based on causes analysis of the drought risk in East Gansu, this paper used the natural disaster risk assessment system of “Hazard-Vulnerability-Exposure”, the corresponding remote sensing data and social and economic data as the data source for drought disaster risk assessment. Drought risk assessment model was established and analyzed by the Analytic Hierarchy Process (AHP), and the three index factors were analyzed by GIS spatial overlay analysis. Finally, the classification and regionalization of drought disaster risk in East Gansu were carried out by the Natural Breakpoint Method. The results indicated that: (1) On the whole, the spatial difference of the drought risk in Qingyang area was significant, showing the characteristics of high in the north and low in the south, and high in the west and low in the east which was mainly due to the uneven spatial and temporal distribution of rainfall. (2) The area of very high, high, medium, low and very low level of drought disaster risk accounted for 11.30％、24.90％、30.96％、18.54％ and 14.3％ in East Gansu, respectively. (3) The very high\|risk areas were mainly concentrated in northern of Huan County and the central area of Qingyang city. The high\|risk areas were mainly distributed in the middle of Huan County, northern of Huachi County and north of Zhenyuan County. The medium\|risk areas were mainly distributed in south of Zhenyuan County, southern of Qingcheng County, southern of Huachi County, west of Zhengning County and south of Ning County. The low\|risk areas were mainly located in east of Ning County and south of Heshui County. The very low\|risk areas were mainly concentrated in east of Qingyang City, including southeast of Huachi County, east of Heshui County, east of Ning County and most areas of Zhengning County. |
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